This is an early adaptation from play to film; this is a different media and should be judged with that criterion in mind. Now you can pick on sound and picture quality. Yet again you need to keep the time of production and copy quality in mind.
I also think that this makes a better stage play and the variations in performances intriguing. However as with listening to the radio in the car, it is the best we can do to keep the memory of the actual orchestra. So when we have to listen to Wayne Newton, we can still imagine "Mack die Messer" No time in 113 minutes for all the songs.
This play was not anti-Nazi in nature. The Nazi regime did not like this play because it showed how illegitimacy could rise to respectability. And as they say in "Harry Potter" books, "you know who," thought that this was too close to the truth.
One of my favorite parts is the marriage of Mackie Messer (Rudolf Foster) a tad pernicious character to Polly (Carola Neher). They collected items from all over to create the perfect environment.
If you are into movies that irk Nazi's try "Westfront 1918 (1930)" Directed by Georg Wilhelm Pabst. You may have to search but it is out there.
Anyway, this is a good movie and worth watching. And watching again.